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Is confidence interval and unbiased confidence interval same thing? if not then what is the basic...

Is confidence interval and unbiased confidence interval same thing? if not then what is the basic difference between them? tell me in details please. thank you.

Math   Statistics-And-Probability   
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Confidence interval

In statistics, a confidence interval is a type of interval estimate, computed from the statistics of the observed data, that might contain the true value of an unknown population parameter.

Using the pivotal quantity method, to obtain an unbiased confidence interval for families of distributions involving truncation parameter. Also, for these families of distributions the unbiased confidence interval is equal to the shortest confidence interval.

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